Big bore 800pv carb help please!!

Hi,
I am thinking of buying a big bore (groupk) top end with working powervalves from a good forum member, but I am struggling with the carbs.
I need to stay with the stockers as I can't afford aftermarket ones at the moment.
Are the oems ok for this top end?/(I assume yes because groupk use them on the 3 cyl)
Where do I start with jetting? I havent got a clue, and I don't want to seize it!
Do I leave the choke plates in?
Do I run aftermarket FA's?
Groupk not really interested as I don't live in the States. (Or I was unlucky and talked to the wrong person when I rang!)
Any help would be great as Scittb is waiting for some money!!

on the I series carb's group K always seem to leave choke plates in (suppose to be better signal @ 3/4 throttle)
as for jetting how big is there big bore-most likely same piston were using for 1390 so you could that to start just set up FAT and go from there
I tired to find the factory pipe jetting for there twin pipe set up,seem not made any more and jetting spec. are gone from there site

GroupK also runs stock air box and stock jetting with adjustments to the screws only. I have found through talking to members here and doing a couple sets of these that the following jetting works well on the triple GK 1390's with aftermarket F/A's installed.

120 Pilot Jet
140 main Jet
2.0 N&S
Black 80gr Spring
Start at 1-1/2 turns out on all screws and tune from there.

on the I series carb's group K always seem to leave choke plates in (suppose to be better signal @ 3/4 throttle)
as for jetting how big is there big bore-most likely same piston were using for 1390 so you could that to start just set up FAT and go from there
I tired to find the factory pipe jetting for there twin pipe set up,seem not made any more and jetting spec. are gone from there site

GroupK also runs stock air box and stock jetting with adjustments to the screws only. I have found through talking to members here and doing a couple sets of these that the following jetting works well on the triple GK 1390's with aftermarket F/A's installed.

120 Pilot Jet
140 main Jet
2.0 N&S
Black 80gr Spring
Start at 1-1/2 turns out on all screws and tune from there.

Thanks Bill,
That's exactly what I needed!
Might get you to work on the stockers for me.

Ok, It looks like it's Lowells work.
What about jetting for that?
How does it differ from groupK's -Im assuming Lowell uses group k's pistons-Is the porting more aggresive/comp higher etc?
Also can somebody send me the instructions for grinding the cases please?